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ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | $ (98) | $ (267) |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent | 124 | (20) | $ (352)
Pension and post-retirement benefit plans adjustment, net of tax | (1) | 12 | 8
Foreign currency translation adjustment, net of tax | 181 | 137 | (379)
Other comprehensive income (loss), net of tax, attributable to TD Group | 56 | 169 | (19)
Balance at end of period | (42) | (98) | (267)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax | (37) | (6) | (112)
Pension Liability Adjustments, Net | 0 |  | 0
Cash Flow Hedging | Designated as Hedging Instrument | Net Sales |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Derivative, Gain (Loss) on Derivative, Net | (3) | (3) |
Derivative, Gain (Loss) on Derivative, Tax Expense (Benefit) | 1 | 1 |
Cash Flow Hedging | Designated as Hedging Instrument | Interest Expense, Net |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Derivative, Gain (Loss) on Derivative, Net | 106 | 71 |
Derivative, Gain (Loss) on Derivative, Tax Expense (Benefit) | 33 | 22 |
Unrealized (loss) gain on derivatives designated and qualifying as cash flow hedges (2) |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | 143 | 123 |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent | (124) | 20 |
Balance at end of period | 19 | 143 | 123
Defined benefit pension plan activity (3) |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | 2 | (10) |
Pension and post-retirement benefit plans adjustment, net of tax | (1) | 12 |
Balance at end of period | 1 | 2 | (10)
Currency translation adjustment |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Balance at beginning of period | (243) | (380) |
Foreign currency translation adjustment, net of tax | 181 | 137 |
Balance at end of period | (62) | (243) | (380)
Accumulated Other Comprehensive Loss |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent | 124 | (20) | (352)
Pension and post-retirement benefit plans adjustment, net of tax | (1) | 12 | 8
Foreign currency translation adjustment, net of tax | $ 181 | $ 137 | $ (379)

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